The public receives environmental information from a variety of sources. Evaluation of a single program or one organization's effort is incomplete. Through surveys and interviews, we evaluate the cumulative impact of outreach by 20 water-related organizations in Maricopa County, Arizona. Household water conservation is a topic addressed by 18 organizations whereas 2 share information on water policy. Similar foci across organizations may help reinforce messages about water conservation, quality, or drought, but can also lead to gaps in water education. These gaps may decrease the relevance of water information to some audiences. Future research should examine additional ways that interorganizational relationships affect the geography of information opportunities and its relevance to unique populations. (Contains 4 figures.)